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科技导报  2014 

深部三场环境下页岩蠕变模型的建立与试验

DOI: 10.3981/j.issn.1000-7857.2014.27.010, PP. 60-65

Keywords: 深部环境,页岩,温度-应力-化学三场共同作用,蠕变特性,非线性蠕变模型

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Abstract:

针对深部环境的复杂性,建立了温度-应力-化学三场共同作用下页岩试样蠕变模型,并探讨了其作用机制。研究表明页岩在复杂环境下蠕变特性的温度效应和pH值化学效应明显,同一级应力水平下温度越高或者化学酸碱性越强,页岩的瞬时应变、蠕变应变及蠕变速率越大,达到稳态蠕变阶段的时间也明显延长。pH值对蠕变特性影响程度比温度的影响更明显。采用非线性元件代替常规线性元件,得到了页岩在深部环境下非线性黏弹塑性蠕变模型,该模型符合深部实际情况,能较好地模拟页岩在深部复杂环境下蠕变,从而求出模型参数。通过试验数据和拟合曲线吻合情况,验证了本模型的正确性。

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